The partially molten upper mantle material calledAnsis a mechanicallyvulnerable layer beneath the lithosphere characterised by low seismic wave velocity and high attenuation.
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Correct answer: A
Explanation
The correct answer is Option 1 i.e.asthenosphere
The partially molten upper mantle material is called the asthenosphere. It is a mechanically vulnerable layer beneath the lithosphere characterized by low seismic wave velocity and high attenuation.